The entrance to the louvre museum in paris, france, is a square pyramid. the side length of the base is 116 feet, and the height of one of the triangular faces is 91.7 feet. find the surface area of the four triangular faces of the entrance to the louvre museum.

The surface area of the four triangular faces can be solve by just using the formula for the area of a triangle, since we are given the height of the one of the triangular faces which is 91.7 ft. and the base is 116 ft

the total surface area = 4 (0.5bh)
we multiply i by 4 because there 4 faces 
b is the base
h is the height
A = 4(0.5) ( 116 ft) ( 91.7 ft)
A = 21274.4 sq ft is the surface area of the four triangular faces